Need some opinions

:welcome: from :canada:
Looks like you've scored a very solid rust free Dart, nice!
I am in agreement with most of the others, get it running and safe, then drive it and enjoy it. If you find that you really want to keep it and improve its performance, then drop in a 360, if not, then you will find it easy to sell to someone else who is looking for a good solid project car.
Just my .02.